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如何将以下二维数组里的键值name换成user ,其他保持不变?
小丑0o鱼
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1. 如何将以下二维数组里的键值name换成user ,其他保持不变?

  1. $data = [[‘name’=>’zhangdan’,’id’=>2],[‘name’=>’lisi’,’id’=>1]];
  2. $data = array_map(function ($item) {
  3. $a = array_replace(array_keys($item),[ 0=>'user']);
  4. return array_combine($a,array_values($item));
  5. }, $data);
  6. var_dump($data); //[['user'=>'zhangdan','id'=>2],['user'=>'lisi','id'=>1]]
  7. 2. 生成一个由1-100组成的数组,要求返回该数组中的偶数组成的新数组,并且新数组的索引从0开始? (提示:你可能会用到的函数:range(), array_map, array_filter, array_values)?
  8. // 通过range()生成数组
  9. $arr = range(1,100);
  10. //方法一,使用array_map
  11. $arr2 =[];
  12. array_map(function ($item) use (&$arr2) {
  13. if (($item % 2) === 0):
  14. $arr2[] = $item;
  15. endif;
  16. },$arr);
  17. echo "<pre>";
  18. print_r($arr2);
  19. //方法二
  20. // 回调直接使用到array_filter中也 可实现
  21. $arr4 = array_values(array_filter($arr, function ($item) {
  22. if (($item % 2) === 0):
  23. return $item;
  24. endif;
  25. }));
  26. echo "<pre>";
  27. print_r($arr4);
Correction status:Uncorrected

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